No.63: Observe the Principles of Painting 

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7 Practical Guidelines for Paint Workers 

Article 6: Observe the Principles of Painting 


The essence of painting lies in faithfully adhering to basic principles throughout all processes, from the preparation stage. Especially important are the points to note during painting, drying, and after drying, as these significantly affect the finish of the painting. 

Observe the Principles of Painting 

The “essence” of painting is not something special; it lies simply in performing all processes, from preparation to cleanup and environmental measures, “correctly.” Here, we will explain the points to note when using paint and during the drying process. 

1. Points to Note When Painting 

1-1. Filtering the Paint

Before using the paint, always filter it. This is essential to remove impurities and maintain painting quality. 

1-2. Viscosity Management

To preserve the quality of the painting, it is important to properly manage the paint’s viscosity. Especially when using an air spray, use an Iwata Cup to adjust the falling time to about 12 seconds as a guide. For paints that require thick application, such as unsaturated polyester or sanding sealer, more than 14 seconds is recommended. In other words, it is important to set the appropriate falling seconds for each paint and maintain its viscosity. 

1-3. Avoid Thick Coating at Once

Avoid applying the paint too thickly at once. Thick coating increases the likelihood of the paint dripping and the thinner remaining, making it difficult for a hard film to form. 

1-4. Overcoating After Drying

Perform the next painting only after the paint film has completely dried. This enhances the strength of the paint film. 

2. Points to Note During and After Drying 

2-1. Avoid Rapid Drying

Rapid heating after painting is likely to cause defects such as bubbling, swelling, and pinholes. It is necessary to set and adhere to appropriate drying conditions. 

2-2. Ensure Ventilation

In the drying area, it is important to ensure good ventilation so that the volatilized solvent components do not remain. Poor ventilation can lead to drying defects and increase the risk of fire. 

2-3. Handling of Masking Tape

Do not remove the masking tape before tack-free drying, and remove it once tack-free drying is complete. 

2-4. Polishing Finish

Perform polishing after the paint film has completely dried. This prevents damage to the paint film. 

2-5. Non-adhesiveness Check Before Shipment

Before shipment, confirm that the painted surface of the product does not stick. It is important to apply paint to a sample board simultaneously with the product painting and confirm that it does not stick using this sample board. 


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